Hi,
I want to analyze DTI-images using FSL. I've received a dataset of images ( in nii.gz format, recorded in 3 different hospitals) and one text-file with bvecs and one with bvals.
I had 16 files per participant that I merged with dcm2niigui 3D>4D. Afterwards I corrected for Eddy currents and I made a brain mask. When I inputted everything (ecc corrected image, brain mask and text-files) in DTIFIT I got the error: 'data bvecs and bvals do not contain the same number of entries'. Indeed, I had 16 bvals (the same number as images) and 48 bvecs (3 times as much). If I understand it correctly, I should also have 16 bvecs (and I assumed maybe that there was one line of bvecs per hospital)!? Is this a correct assumption?
Consequently, I tried the analysis with 16 bvecs (all 3 options) but this resulted in the error: 'terminate called after throwing an instance of ‘NEWMAT::IndexException’.
I'm new to FSL so I don't understand everything yet, can anybody tell me what is going wrong?
Thank you very much!
Nele
|